I Have a 1979 Chevy Camaro it has an 86 pontiac 305 in it will i be able to install...

[Steven]

...an A/C unit it? presently does not have a plenum chamber

 

[Herbert J]

If your car is factory air,you will find every thing you need at a auto wrecking yard.305 is a small block chevy.

 

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Should be no problem as Pontiac did not make a 305 . Sure you don't have a 301 ? If 305 then original Chevy stuff will work . If 301 , you will need Pontiac brackets . Also , since no more R12 , you will need to convert to 134 . Seriously consider getting this done at good repair shop - one you know will not screw you as this needs to be done properly in order to cool correctly .